Answer:
B and c
Step-by-step explanation:
Hey there.
a)80/100=8/10=4/5=0.8 so a is not equivalent
b)-800/100=-8 so b is equivalent
c)80/(-10)=-8 so c is equivalent
d)-80/-10=8 so d is not equivalent
e) -80-(-10)=-80+10=-70 so is not equivalent
Therefore I believe B and C are equivalent.
